816650660 has 72 divisors (see below), whose sum is σ = 2004295104. Its totient is φ = 278685120.

The previous prime is 816650633. The next prime is 816650671. The reversal of 816650660 is 66056618.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220625 + ... + 224295.

It is an arithmetic number, because the mean of its divisors is an integer number (27837432).

Almost surely, 2^816650660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 816650660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1002147552).

816650660 is an abundant number, since it is smaller than the sum of its proper divisors (1187644444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816650660 is a wasteful number, since it uses less digits than its factorization.

816650660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3921 (or 3912 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 816650660 is about 28577.1002727709. The cubic root of 816650660 is about 934.7140536558.

The spelling of 816650660 in words is "eight hundred sixteen million, six hundred fifty thousand, six hundred sixty".